Joystick Visualizer is an offline version based on the code of Anton Natarov (https://linkedin.com/in/antonnatarov/en)
Original application can be found here (https://tealyatinasite.appspot.com/joystick/)
Original documentation can be found here (https://web.archive.org/web/20220818185347/http://www.teall.info/2019/03/joystick-visualizer.html)